#include <stdio.h>
#define M 3e-23
int main(int agrc, char const *argv)
{
    int num;
    printf("请输入水分子的夸脱数：");
    scanf("%d", &num);
    printf("num=%d\n", num);

    printf("%d夸脱水水中有%e个水分子\n", num, num * 950 / M);
    return 0;
}